Please refer to the steps below to set hybrid HDD function.
1. Click Control Panel - Change battery settings.
2. Click Change the plan setting - Change advanced power settings.
3. Select Hard disk option in Power Options dialog, and set On Battery and Plugged In arbitrarily. Click OK to save the current settings.

Note:
1. This solution is only applicable to VAIO notebook models that comes with hybrid HDD.

2. Hybrid HDD: it adopts technologies from a standard hard drive and newer flash drives. Essentially, it is a standard hard drive that has flash memory installed on it as well. It uses much less energy and extends a notebook overall battery life.